Upper-mounted full-drift-diameter LNG soft-seal zero-leakage two-way valve

Abstract

An upper-mounted full-drift-diameter LNG soft-seal zero-leakage two-way valve comprises a valve body, a valve seat, a valve core and a valve rod. The valve seat is arranged on one side of the valve body. The valve seat and the valve body are rotationally locked. A soft seal is arranged on the valve seat. A sealing ring is mounted on the valve core. The valve core is sleeved with a shaft sleeve of the valve body. The most protruding point, close to the arc, of the arc face of the soft seal and the most protruding point, close to the arc, of the arc face of the sealing ring are extruded in a wedge-shaped manner to form a linear seal. The shaft sleeve of the valve body is mounted into an lengthened valve cover. The valve rod penetrates the lengthened valve cover and a padding part and then is locked. The valve rod is connected with an execution mechanism. The torque of the execution mechanism is transmitted to the valve core through the valve rod and drives the valve core to be opened, closed and rotated. According to the upper-mounted full-drift-diameter LNG soft-seal zero-leakage two-way valve, the double-way valve is simple in structure, free of inner cavity dead corners, free of pressure relief discharge, convenient to disassemble and assemble and low in online maintenance cost. The drift-diameter circulating capacity is high, the double-flow-way zero leakage is achieved, the sealing is reliable, and the maintenance cost of an LNG pipeline system is lowered.

Description

technical field [0001] The invention relates to a valve for LNG liquefied natural gas pipeline, in particular to a top-loading full-bore LNG soft-sealing zero-leakage two-way valve. Background technique [0002] LNG is a clean energy. The greenhouse gas produced by the combustion of natural gas is only 1 / 2 of that of coal and 2 / 3 of that of oil. The pollution to the environment is far less than that of oil and coal. Therefore, accelerating the development and rational utilization of natural gas can effectively improve the atmospheric environment and promote the realization of emission reduction targets. Global climate change will increase the demand for natural gas and bring opportunities for the development of the natural gas and LNG industry. [0003] In the automatic process control of the LNG transportation pipeline in the cryogenic working condition of -160°C to -196°C, the volume of LNG is 624 times smaller than that of natural gas of the same mass, so LNG can be tra...

AI Technical Summary

Problems solved by technology

The ball valve is sealed by the long-term extrusion of the valve seat on the spherical surface, the seal wears quickly, and there is a dead angle in the inner cavity, so it is difficult to control the pressure relief and discharge.

The butterfly valve has a large flow resistance coefficient, the rubber seal is not suitable for LNG industrial and mining, and the metal seal cannot achieve zero leakage

Traditional top-entry hemispherical valves are difficult to process and expensive to replace, the valve seat cannot meet the full bore requirement, and the flow capacity is low

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